This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAID50X250, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SID Series Double-Rod Cylinder SID50X250
The AirTAC Airtac SID Series Double-Rod Cylinder SID50X250 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 250mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAID50X250, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke250 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAID50X250
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SID Series Double-Rod Cylinder SID50X250
The AirTAC SID50X250 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. Because both faces use the rod-side area, push and pull force are equal at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This model is discontinued and end-of-life; the direct replacement is the SAID50X250, matching the 50mm bore, 250mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for long life and low start-up pressure.
This non-magnet SKU cannot take a magnetic switch. The second rod provides anti-rotation guidance and can drive two tools simultaneously. A plain cylinder does not hold loads on air loss; the 30mm adjustable cushion only decelerates near stroke end. For held loads, use an external rod lock or SAIL/BSAI variant.
Airtac SID Series Double-Rod Cylinder SID50X250 Technical Specifications
| Model | Airtac SID Series Double-Rod Cylinder SID50X250 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAID50X250 |
| Bore size | Ø50 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAID50X250 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAID50X250 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SID Series Double-Rod Cylinder SID50X250
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SID Series Double-Rod Cylinder SID50X250 Is Used
Twin-Tool Drive Station
Uses the protruding rod at the rear end to drive a secondary mechanism or tool simultaneously, leveraging the equal both-ways force for balanced 825 N @0.5 MPa operation.
Symmetrical Transfer Gate
Shifts a diverting gate from either side of a conveyor line, ensuring identical 1154 N @0.7 MPa push and pull forces for consistent actuation speeds.
Replacing the Airtac SID Series Double-Rod Cylinder SID50X250 with the SAID50X250
Replace the discontinued SID50X250 directly with the SAID50X250, reusing your existing FA, LB, or TC ISO 15552 mounts. Size both ways by checking neighbour bores: the 40mm yields 528/739/950 N, and the 63mm yields 1402/1962/2523 N. A double rod is right when you need equal both-ways force, anti-rotation stability, or a back rod to carry a sensor cam. This SKU lacks the -S magnet, so it cannot accept legacy CS1-B/DS1-B sensors. For this 250mm stroke (under 300mm), side-load alignment is standard. Remember, air cushions only decelerate; they do not lock. For load holding without live air, specify an external pilot-operated check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAID50X250
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SID Series Double-Rod Cylinder SID50X250 FAQ
Yes, the AirTAC SID50X250 is discontinued. The direct replacement is the SAID50X250, which matches the 50mm bore, 250mm stroke, G1/4 port, and ISO 15552 mounting interface. The SAI family also adds an upgraded piston seal and SAIL/BSAI lock variants.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4, the rod is Ø20mm with an M16x1.5 thread, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAID50X250
Send us the quantity and destination. We confirm price, stock and lead time on the SAID50X250 replacement — usually within 7-8 hours.